Dr. Mehmet Oz dispelled common summer health myths on the July 7 episode of the Dr. Oz Show. One dangerous myth is that a sunburn fades into a tan. But Dr. Oz said this is simply not true because a sunburn actually damages your skin cells. "When the sun hits your skin, it doesn't just tan it, it destroys it," he said.

While some sun exposure is important because of the health-promoting vitamin D your body absorbs, too much sun can cause premature wrinkles, age sports, and increase your risk of skin cancer. If you still want to get a tan, make sure you spend a short amount of time in the sun daily and build up your tan gradually, said Dr. Oz.

Another summer health myth Oz busted is you have to wait 20 minutes after eating before you can swim, and peeing on a jellyfish sting alleviates pain. Both are false. Urine can even cause a jellyfish sting to hurt even more. The best way to deal with a jellyfish sting is to splash vinegar or some other acidic compound on your wound.

When the temperatures rise, Dr. Oz said a cold shower is actually less effective than a warm shower if you're trying to cool down. Similarly, Dr. Oz said a hot drink, like coffee or tea, cools you off better than a cold drink because it induces sweating, which ultimately lowers your core temperature.

On a related note, Dr. Oz said drinking one extra cup of coffee a day could reduce your type 2 diabetes risk by 10 percent. Previous research has shown coffee enhances weight loss by suppressing appetite without the need for targeted calorie restriction.

Scientists said coffee contains antioxidants, which help metabolize sugar, according to a study conducted by the Harvard School of Public Health. Interestingly, a similar effect was observed with decaffeinated coffee.

“It’s not the caffeine,” said Dr. Shilpa N. Bhupathiraju, a research fellow at Harvard. “But coffee has a lot of antioxidants and other bioactive compounds. Our findings confirm those of previous studies that showed that higher coffee consumption was associated with lower type 2 diabetes risk."

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Samantha Chang is the co-owner of www.theimproper.com., an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha enjoys running, cycling and taking photos. Contact her at schang@theImproper.com.